I think it would be better to change the “new messages” counter to an “unread messages” counter
Currently when you enter a chat with 30 new messages you read the last 5 and leave, the counter disappears, I think it would be better to keep it but now with the number 25, indicating that there are 25 unread messages.
He thought it is more informative, and it is a small step to solve the problem of lost messages.